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<Title>Polar Spline Chart</Title>
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<p class="heading0">ChartDirector 7.0 (Java Edition)</p>
<p class="heading1">Polar Spline Chart</p>
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<img src="images/polarspline.png" width='460' height='460'>
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This example demonstrates polar spline line and polar spline area.<br><br>
The polar spline line is created using <a href="PolarChart.addSplineLineLayer.htm">PolarChart.addSplineLineLayer</a>. The polar spline area is created using <a href="PolarChart.addSplineAreaLayer.htm">PolarChart.addSplineAreaLayer</a>.
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<p class="heading1a">Source Code Listing</p>
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<b>[JSP Version]</b> jspdemo/polarspline.jsp
<div class='codeblock'><code class='pre'>&lt;%@page import="ChartDirector.*, java.util.*" %&gt;
&lt;%
// The data for the chart
double[] data0 = {5.1, 2.6, 1.5, 2.2, 5.1, 4.3, 4.0, 9.0, 1.7, 8.8, 9.9, 9.5, 9.4, 1.8, 2.1, 2.3,
    3.5, 7.7, 8.8, 6.1, 5.0, 3.1, 6.0, 4.3};
double[] angles0 = {0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240,
    255, 270, 285, 300, 315, 330, 345};

double[] data1 = {8.1, 2.5, 5, 5.2, 6.5, 8.5, 9, 7.6, 8.7, 6.4, 5.5, 5.4, 3.0, 8.7, 7.1, 8.8, 7.9,
    2.2, 5.0, 4.0, 1.5, 7.5, 8.3, 9.0};
double[] angles1 = {0, 15, 30, 45, 60, 75, 90, 105, 120, 135, 150, 165, 180, 195, 210, 225, 240,
    255, 270, 285, 300, 315, 330, 345};

// Create a PolarChart object of size 460 x 460 pixels
PolarChart c = new PolarChart(460, 460);

// Add a title to the chart at the top left corner using 15pt Arial Bold Italic font
c.addTitle2(Chart.TopLeft, "&lt;*underline=2*&gt;EM Field Strength", "Arial Bold Italic", 15);

// Set center of plot area at (230, 240) with radius 180 pixels
c.setPlotArea(230, 240, 180);

// Set the grid style to circular grid
c.setGridStyle(false);

// Add a legend box at the top right corner of the chart using 9pt Arial Bold font
c.addLegend(459, 0, true, "Arial Bold", 9).setAlignment(Chart.TopRight);

// Set angular axis as 0 - 360, with a spoke every 30 units
c.angularAxis().setLinearScale(0, 360, 30);

// Add a red (0xff9999) spline area layer to the chart using (data0, angles0)
c.addSplineAreaLayer(data0, 0xff9999, "Above 100MHz").setAngles(angles0);

// Add a blue (0xff) spline line layer to the chart using (data1, angle1)
PolarSplineLineLayer layer1 = c.addSplineLineLayer(data1, 0x0000ff, "Below 100MHz");
layer1.setAngles(angles1);

// Set the line width to 3 pixels
layer1.setLineWidth(3);

// Output the chart
WebChartViewer viewer = new WebChartViewer(request, "chart1");
viewer.setChart(c, Chart.SVG);

// Include tool tip for the chart
viewer.setImageMap(c.getHTMLImageMap("", "",
    "title='{dataSetName} EM field at {angle} deg: {value} Watt'"));
%&gt;
&lt;!DOCTYPE html&gt;
&lt;html&gt;
&lt;head&gt;
    &lt;title&gt;Polar Spline Chart&lt;/title&gt;
    &lt;!-- Include ChartDirector Javascript Library to support chart interactions --&gt;
    &lt;script type="text/javascript" src="cdjcv.js"&gt;&lt;/script&gt;
&lt;/head&gt;
&lt;body style="margin:5px 0px 0px 5px"&gt;
    &lt;div style="font:bold 18pt verdana;"&gt;
        Polar Spline Chart
    &lt;/div&gt;
    &lt;hr style="border:solid 1px #000080; background:#000080" /&gt;
    &lt;div style="font:10pt verdana; margin-bottom:1.5em"&gt;
        &lt;a href="viewsource.jsp?file=&lt;%=request.getServletPath()%&gt;"&gt;View Source Code&lt;/a&gt;
    &lt;/div&gt;
    &lt;!-- ****** Here is the chart image ****** --&gt;
    &lt;%= viewer.renderHTML(response) %&gt;
&lt;/body&gt;
&lt;/html&gt;</code></div>
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<br><hr class="separator"><div class="copyright">&copy; 2022 Advanced Software Engineering Limited. All rights reserved.</div>
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